used ammonia for many years,great product,yada,yada,yada,etc.the big things to lookout for are,equipment condition,junk will hurt you everytime.wind direction,always plan hookups or repairs so you are upwind,and have a plan,if a hose breaks,or tank pin shears,or a shank breaks and falls off,run through your mind what your plan of action is going to be,and a little squirt bottle of water close by is a pretty handy thing.